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Infaunal: Organisms which live in soft sediment and are large enough to displace sediment.

Interglacial: A comparatively long warmer phase of a glacial period when considerable glacial retreat occurs.

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Journal: Used to describe scientific magazines and papers.

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Keystone species: A predator at the top of a food web, capable of consuming organisms of more than one tropic level beneath it and strongly affecting community structure.

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Lander system: Scientific instrument designed for temporary deployment on the sea floor in order to monitor environmental parameters.

Larvae: A juvenile phase differing markedly in morphology and ecology from the adult.

Larval settlement: Settling of planktonic larvae on any hard substrate.

Lithoherm: Consolidated ridge-like seabed elevations composed of skeletal material such as coral rubble.

Longshore current: A current moving parallel to the shoreline.